PURPA was passed by the U.S. Congress in 1978. The impetus for this law was primarily: (a) A push by the U.S. Congress to deregulate the electric utility industry (b) Technology advancements in renewable energy as a result of the U.S. space program (c) The need to modernize utility regulatory rules after the PUHCA law of 1935 (d) An energy crisis in the early 1970s